In Colorado, there are determinate (known) and indeterminate (unknown) time periods in sentencing. If your son was sentenced to a maximum of thirty years for armed robbery - the question that you are asking is when would he be eligible for parole. Depending on the charges he was convicted of aggravated robbery - which is a class 3 felony; he would be required to serve at least the midpoint of the presumptive sentencing range. It would be best to look at the sentencing paperwork from the court.
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